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Intangible Liabilities - Charter Agreements - Schedule of Intangible Liabilities (Table) (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2023	Dec. 31, 2022
Opening balance		$ 14,218	$ 55,376
Disposals	[1]	(476)	0
Amortization		(5,045)	(41,158)
Total		$ 8,697	$ 14,218
[1] The unamortized portion of GSL Amstel intangible liability-charter agreement when vessel was sold on March 23, 2023.

X

- Definition

Amount of non-cash amortization of intangible liability for below market leases.

+ References

No definition available.

+ Details

Name:	gsl_AmortizationOfBelowMarketLeases
Namespace Prefix:	gsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of disposals of intangible liability for below market leases.

+ References

No definition available.

+ Details

Name:	gsl_DisposalsOfBelowMarketLeases
Namespace Prefix:	gsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Non current portion of the excess of the market value of vessel charters over contracted value of the charters at the date of merger. The intangible lease liability is amortized as an increase in time charter revenue over the remaining term of the relevant charter.

+ References

No definition available.

+ Details

Name:	gsl_IntangibleLiabilityCharterAgreementsNoncurrent
Namespace Prefix:	gsl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant